بسم الله الرحمن الرحيم
In the above mentioned case, the whole property left by your father shall be divided into 72 shares. Out of the total, 9 shares shall go to your mother, 6 shares to your phuphi from your grandmother and you shall receive 38 shares while your sister 19 shares.
The detail of division is as follows:
Note: This division is correct provided your grandmother left only you, your sister and your phuphi as her legal heirs.
Allah knows Best!
Darul Uloom Deoband